Pollutant Concentrations

Air quality readings will be available hourly from 7am to 11pm. Air quality readings from 12am to 6am will be made available at 7am on the same day.

Readings on 05 Dec 2014

View reading for:

Region

24-hr Sulphur dioxide(µg/m3)

24-hr PM10(µg/m3)

1-hr Nitrogen dioxide(µg/m3)a

8-hr Ozone(µg/m3)

8-hr Carbon monoxide(mg/m3)

24-hr PM2.5(µg/m3)

North

9(6)

33(33)

36(-)

94(40)

0.5(5)

19(59)

South

61(38)

39(39)

40(-)

79(33)

0.4(4)

25(66)

East

32(20)

33(33)

25(-)

96(40)

0.3(3)

24(65)

West

27(17)

40(40)

51(-)

90(38)

0.5(5)

25(66)

Central

45(28)

34(34)

47(-)

111(47)

0.4(4)

24(64)

1-hr PM2.5 (µg/m3)b Readings on 05 Dec 2014

View reading for:

Time

1am

2am

3am

4am

5am

6am

7am

8am

9am

10am

11am

12pm

North

23

18

22

25

11

17

12

7

16

20

24

22

South

22

21

22

14

21

15

15

18

27

12

16

29

East

29

29

29

18

17

17

16

13

13

12

17

25

West

20

13

20

15

22

14

20

22

21

20

15

12

Central

12

21

14

14

20

17

14

24

23

19

7

10

Time

1pm

2pm

3pm

4pm

5pm

6pm

7pm

8pm

9pm

10pm

11pm

12am

North

18

19

27

30

34

21

15

22

13

9

4

-

South

39

47

35

30

50

45

41

22

10

18

7

-

East

25

35

33

31

42

46

28

29

20

16

14

-

West

15

17

29

37

47

44

47

43

44

27

17

-

Central

29

54

37

33

41

49

40

33

21

13

11

-

Note:a Sub-index for nitrogen dioxide is reported only when the 1-hr concentration equals or exceeds 1130 µg/m3.

b There is no sub-index for 1-hr PM2.5.

3-hr PSI Readings from 1am to 12am on
05 Dec 2014

Time

1am

2am

3am

4am

5am

6am

7am

8am

9am

10am

11am

12pm

3-hr PSI

62

62

61

60

59

57

56

55

57

58

57

57

Time

1pm

2pm

3pm

4pm

5pm

6pm

7pm

8pm

9pm

10pm

11pm

12am

3-hr PSI

60

67

72

74

78

81

82

77

70

63

56

-

Hourly updates of 3-hr PSI readings are provided from 7am to 11pm. The 3-hr PSI readings from 12am to 6am will be made available at 7am on the same day. The 3-hr PSI readings are calculated based on PM2.5 concentrations only.